The Pioneer Woman website, the Serious Eats website and the Food Network website all have prime rib recipes that require a 500-degree cooking time, as of August 2015. Each recipe requires roasting the prime rib at 500 F for only part of the total cooking time.
Sear the outside of the prime rib using a cast iron skillet and some olive oil, suggests the Pioneer Woman recipe. Then apply a dry rub to the outside. Finally, roast the meat for 20 to 30 minutes in a 500 F oven, and then reduce the temperature to 300 F, and cook it for 20 to 30 more minutes.
Cook the prime rib for 210 to 240 minutes in a 200 F oven, then remove the prime rib from the oven, and allow it to rest for 30 to 90 minutes, advises the Serious Eats site. Finish the prime rib in a 500 to 550 F oven for 6 to 10 minutes just before serving.
Roast prime rib in a 500 F oven for 45 minutes, suggests Ina Garten on the Food Network website. Then reduce the oven temperature to 325 F, and continue roasting. After 30 minutes, increase the oven temperature to 450 F, and cook the prime rib for 15 to 30 more minutes. Remove the prime rib from the oven when the internal temperature is 125 F.